Miasma is a noun referring to a noxious or oppressive atmosphere or influence, often perceived as spiritually or physically unhealthy. Historically linked to ancient medical theories of miasmata, it denotes a pervasive contaminate or atmosphere that fouls the air and mood. In modern usage, it can describe an oppressive ambiance or a corrupting influence, not necessarily a literal gas. (2-4 sentences, 50-80 words)
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